OCR may refer to:
- Optical character recognition, conversion of images of text into characters
- The OCR-A font, designed to simplify character recognition
- The similar OCR-B font
- Transvaginal oocyte retrieval, a technique used in in vitro fertilization
- Over consolidation ratio, a consolidation measurement in geotechnical engineering
- Official Cash Rate, the interest rate paid by banks in the overnight money market
- Optimum currency region, a theoretical optimal area where one currency would make most benefit
- Oxford, Cambridge and RSA Examinations, a UK-based exam board
- OverClocked ReMix, an organization and website dedicated to preserving and paying tribute to video game music through re-orchestration and reinterpretation
- Ottawa Central Railway a Canadian Shortline owned by CN Rail
- Oxidizable carbon ratio dating, a method of absolute dating
- Offices of Civil Rights, common sub-agency or sub-component name of U.S. federal agencies:
- State Office of Civil Rights, U.S. Department of State
- GSA Office of Civil Rights, General Services Administration
- ED Office for Civil Rights, U.S. Department of Education
- HHS Office for Civil Rights, U.S. Department of Health and Human Services
- DOJ Office for Civil Rights, Office of Justice Programs (OJP)
- Organically moderated and cooled reactor, a type of nuclear reactor